Sandwich-structured composite

About: Sandwich-structured composite is a research topic. Over the lifetime, 5853 publications have been published within this topic receiving 101126 citations.

High-temperature high-velocity impact on honeycomb sandwich panels

Abstract: This work presents an investigation on the damage and high-speed impact deformation mechanisms at elevated temperatures in honeycomb sandwich panels made from PM1000 and PM2000 alloys. The impact temperatures ranged from 22 °C to 866 °C. The investigation was performed experimentally using a custom-made gas gun rig, and by using Finite Element and developing a phenomenological analytical model to predict the residual velocity and ballistic limit equations for the case in which the diameter of the projectile is close or smaller to the honeycomb cell length. The sizes of the holes have been also evaluated by carrying out numerical thermal loading simulations on honeycomb sandwich specimen models impacted at high speed. The predictions provided by the Finite Elements and the analytical model give a good agreement with the results from the experimental tests. The hole diameters for the two idealized normal impact cases, in which the projectile hits the cell core and at the triple-wall intersection of the core, were also presented as a function of the projectile diameter and velocity in this paper.

Response of Actively Cooled Metal Foam Sandwich Panels Exposed to Thermal Loading

Abstract: Experimental and analytical results for the thermomechanical response of actively cooled metal foam sandwich panels are presented With a favorable strength-to-weight ratio and a high specific internal surface area, sandwich panels with metal foam cores are proposed for actively cooled load-bearing components in aerospace thermal protection system applications First, inconel foam sandwich panels are subjected, via experimental means, to through-the-thickness thermal gradients, defined by fixed temperature conditions on opposite face sheets With clamped boundary conditions, provided through a test fixture designed to minimize the common conflict of thermal and mechanical boundary conditions in experimental apparatus, the metal foam sandwich panels exhibit out-of-plane bending deformation The thermomechanical deformation within the panel is then mitigated through active cooling, achieved by pumping compressed air through the metal foam core Subsequently, the experimental measurements are used to develop a sequentially coupled thermomechanical finite element model Central to the numerical characterization of metal foam sandwich panels is an understanding of the response of metal foam under shear loading The material model for the foam is taken from a series of experimental measurements of the shear response of metal foam, providing density-dependent relationships for material stiffness and strength The numerical model provides a strain-temperature history for metal foam sandwich panels under through-the-thickness thermal gradients

Steel-concrete-steel sandwich composite structures subjected to extreme loads

Abstract: This paper summarizes the latest research and development work on steel-concrete-steel (SCS) sandwich composite structures for the use as Arctic offshore platform, and to resist impact and blast loads. Current development of ultra-lightweight cement composite (ULCC) and a floatable structural cement composite (FSCC) to be used as infilled materials for SCS sandwich structure are presented. This paper aims to advance the application of SCS sandwich composite with the use of steel plate and lightweight concrete materials. A series of tests on lightweight SCS sandwich panels with shear connectors has been carried out. The superior performance of SCS sandwich panel is demonstrated. The results show that SCS sandwich with novel J-hook connectors is effective in preventing plate separation from concrete core, maintaining the structural integrity.